[Kea-users] DHCP Release message and DHCP4_PACKET_DROP_0003

[Jason Guy]

I tried this in my lab, and option 54 is supposed to be set to the DHCP
server IP which assigned the IP.
Regardless, it can not be the global broadcast address as far as I know.

According to RFC2132:

9.7 <https://tools.ietf.org/html/rfc2132#section-9.7>. Server Identifier

   This option is used in DHCPOFFER and DHCPREQUEST messages, and may
   optionally be included in the DHCPACK and DHCPNAK messages.  DHCP
   servers include this option in the DHCPOFFER in order to allow the
   client to distinguish between lease offers.  DHCP clients use the
   contents of the 'server identifier' field as the destination address
   for any DHCP messages unicast to the DHCP server.  DHCP clients also
   indicate which of several lease offers is being accepted by including
   this option in a DHCPREQUEST message.

   The identifier is the IP address of the selected server.

   The code for this option is 54, and its length is 4.



Hope this helps,

Jason

On Tue, May 9, 2017 at 10:42 AM, S. M. Hossein Hamidi <
hossein.hamidi at gmail.com> wrote:

> Hi,
>
> I have a kea installation with a relay agent ahead. Normal DHCP operations
> except DHCP Release works well. When, I send a DHCP Release message I
> encounter following error message:
>
> "DHCP4_PACKET_DROP_0003 [hwtype=1 00:00:00:11:11:11], cid=[no info],
> tid=0x3602fcf, from interface ens39: it contains a foreign server
> identifier"
>
> Below is the packet content I captured using Wireshark. By the way, the
> server IP Address is 192.168.234.100 and Relay Agent IP address is
> 192.168.0.5
>
> -------------------------------
> Frame 522: 294 bytes on wire (2352 bits), 294 bytes captured (2352 bits)
> on interface 0
> Linux cooked capture
> Internet Protocol Version 4, Src: 192.168.234.1, Dst: 192.168.234.100
> User Datagram Protocol, Src Port: 67 (67), Dst Port: 67 (67)
> Bootstrap Protocol (Release)
>     Message type: Boot Request (1)
>     Hardware type: Ethernet (0x01)
>     Hardware address length: 6
>     Hops: 1
>     Transaction ID: 0x03602fcf
>     Seconds elapsed: 0
>     Bootp flags: 0x0000 (Unicast)
>     Client IP address: 255.255.255.255
>     Your (client) IP address: 0.0.0.0
>     Next server IP address: 192.168.234.100
>     Relay agent IP address: 192.168.0.5
>     Client MAC address: 00:00:00_11:11:11 (00:00:00:11:11:11)
>     Client hardware address padding: 00000000000000000000
>     Server host name not given
>     Boot file name not given
>     Magic cookie: DHCP
>     Option: (53) DHCP Message Type (Release)
>         Length: 1
>         DHCP: Release (7)
>     Option: (54) DHCP Server Identifier
>         Length: 4
>         DHCP Server Identifier: 255.255.255.255
>     Option: (255) End
>         Option End: 255
> ----------------------------------
>
> Any idea what could be the cause of this problem?
>
> Regards,
>
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